java中方法的好习惯

Question

I have a method that read from database and get some string there. According what I get I will override that string for another that I already know. For example:

• str → string
• bin → binary
• and so on..

My question is, what is the best practice for doing this? Of course I already thought about if's...

if (str.equals("str"))
    str = "string";

A file that have this things pre-defined, a multi-dimensional array, etc.. But this all seems a quite newbie, so what do you recommend? What is the best way?

Answer 1

Use a Map:

// create a map that maps abbreviated strings to their replacement text
Map<String, String> abbreviationMap = new HashMap<String, String>();

// populate the map with some values
abbreviationMap.put("str", "string");
abbreviationMap.put("bin", "binary");
abbreviationMap.put("txt", "text");

// get a string from the database and replace it with the value from the map
String fromDB = // get string from database
String fullText = abbreviationMap.get(fromDB);

You can read more about Maps here .

Answer 2

You could use a map, for example:

Map<String, String> map = new HashMap<String, String>();
map.put("str", "string");
map.put("bin", "binary");

// ...

String input = ...;
String output = map.get(input); // this could be null, if it doesn't exist in the map

Answer 3

Map is a good option as people have suggested. The other option which I normally consider in this scenario is Enum. It gives you an additional capability of adding behavior for a combination.